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Goodwill and other intangibles (Details) - USD ($)
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]        
Goodwill $ 159,595,000 $ 159,595,000 $ 159,595,000 $ 159,595,000
Other Intangible Assets, Net 7,060,000 8,781,000 7,462,000 9,260,000
Amortization of Intangible Assets 402,000 479,000    
Finite-lived Intangible Assets Acquired 14,456,000   14,456,000  
Indefinite-lived Intangible Assets Acquired 1,300,000   1,300,000  
Finite-Lived Intangible Assets, Accumulated Amortization 8,696,000   8,294,000  
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 1,085,000      
Finite-Lived Intangible Assets, Amortization Expense, Year Two 1,323,000      
Finite-Lived Intangible Assets, Amortization Expense, Year Three 1,215,000      
Finite-Lived Intangible Assets, Amortization Expense, Year Four 1,042,000      
Finite-Lived Intangible Assets, Amortization Expense, Year Five 887,000      
Intangible Assets, Gross (Excluding Goodwill) 15,756,000   15,756,000  
Intangible Assets, Net (Including Goodwill) 166,655,000 $ 168,376,000 167,057,000 $ 168,855,000
Core Deposits [Member]        
Finite-Lived Intangible Assets [Line Items]        
Finite-Lived Intangible Assets, Accumulated Amortization 7,396,000   6,994,000  
Trade Names [Member]        
Finite-Lived Intangible Assets [Line Items]        
Finite-Lived Intangible Assets, Accumulated Amortization $ 1,300,000   $ 1,300,000